package com.forum.ajax.homepage;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.JSONObject;

import com.forum.domain.Topic;
import com.forum.domain.TopicDAO;
import com.forum.domain.Ucg;
import com.forum.domain.UcgDAO;
import com.forum.domain.Uct;
import com.forum.domain.UctDAO;
import com.forum.domain.User;
import com.forum.domain.UserDAO;

public class UnfollowTopic extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public UnfollowTopic() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html; charset=utf-8");
		PrintWriter out = response.getWriter();

		String type = request.getParameter("type");
		int id = Integer.parseInt(request.getParameter("id"));
		UserDAO userdao = new UserDAO();
		User user = userdao.findById(id);

		int topicid = Integer.parseInt(request.getParameter("topicid"));
		TopicDAO topicDAO = new TopicDAO();
		Topic topic = topicDAO.findById(topicid);

		try {
			if (type.equals("unfollow")) {
				UctDAO uctdao = new UctDAO();
				List<Uct> uctlist = uctdao.findByProperty("user", user);
				for (int i = 0; i < uctlist.size(); i++) {
					if (uctlist.get(i).getTopic() == topic) {
						uctdao.delete(uctlist.get(i));
						uctdao.getSession().beginTransaction().commit();
						user.setTopiccount(user.getTopiccount() - 1);
						break;
					}
				}
				out.print("success");
			} else {
				UctDAO uctdao = new UctDAO();
				List<Uct> uctlist = uctdao.findByProperty("user", user);
				for (int i = 0; i < uctlist.size(); i++) {
					if (uctlist.get(i).getTopic() == topic) {
						out.print("已经关注!");
						return;
					}
				}
				Uct uct = new Uct(topic, user);
				uctdao.save(uct);
				uctdao.getSession().beginTransaction().commit();
				user.setTopiccount(user.getTopiccount() + 1);

			}
		} catch (Exception e) {
			e.printStackTrace();
			out.print("error");
		}
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
